AES-CMAC using OpenSSL/libcrypto

mac_example.c

// compile with 
// cc `PKG_CONFIG_PATH="/usr/local/opt/openssl@1.1/lib/pkgconfig" pkg-config --cflags --libs openssl` mac_example.c -o mac_example
// cc -I/usr/local/Cellar/openssl@1.1/1.1.1h/include -L/usr/local/Cellar/openssl@1.1/1.1.1h/lib -lssl -lcrypto mac_example.c
#include <stdio.h>
#include <openssl/cmac.h>

void printBytes(unsigned char *buf, size_t len) {
  for(int i=0; i<len; i++) {
    printf("%02x ", buf[i]);
  }
  printf("\n");
}

int main(int argc, char *argv[])
{
  // https://tools.ietf.org/html/rfc4493
   
  // K, M and T from 
  // http://csrc.nist.gov/publications/nistpubs/800-38B/Updated_CMAC_Examples.pdf
  // D.1 AES-128

  // K: 2b7e1516 28aed2a6 abf71588 09cf4f3c
  unsigned char key[] = { 0x2b,0x7e,0x15,0x16, 
                          0x28,0xae,0xd2,0xa6,
                          0xab,0xf7,0x15,0x88,
                          0x09,0xcf,0x4f,0x3c};

  // M: 6bc1bee2 2e409f96 e93d7e11 7393172a Mlen: 128
  unsigned char message[] = { 0x6b,0xc1,0xbe,0xe2, 
                              0x2e,0x40,0x9f,0x96, 
                              0xe9,0x3d,0x7e,0x11, 
                              0x73,0x93,0x17,0x2a };

  unsigned char mact[16] = {0}; 
  size_t mactlen;

  CMAC_CTX *ctx = CMAC_CTX_new();
  CMAC_Init(ctx, key, 16, EVP_aes_128_cbc(), NULL);
  printf("message length = %lu bytes (%lu bits)\n",sizeof(message), sizeof(message)*8);
 
  CMAC_Update(ctx, message, sizeof(message));
  CMAC_Final(ctx, mact, &mactlen);

  printBytes(mact, mactlen);
  /* expected result T = 070a16b4 6b4d4144 f79bdd9d d04a287c */

  CMAC_CTX_free(ctx);
  return 0;
}

Hello.
I want to run the file, but I don't know how to compile it. Could you please teach me how to compile it?

gcc cmac_example.c -I /usr/local/opt/openssl@1.1/include/ -L /usr/local/opt/openssl@1.1/lib -l libcrypto

I've tried to do something like this.

ld: library not found for -llibcrypto
collect2: error: ld returned 1 exit status

It depends on your system but you can use pkg-config to get the appropriate compile flags for openssl (if you have pkg-config and the openssl.pc file ) like so:

cc `PKG_CONFIG_PATH="/usr/local/opt/openssl@1.1/lib/pkgconfig" pkg-config --cflags --libs openssl` mac_example.c -o mac_example

in my system that command will expand to :

cc -I/usr/local/Cellar/openssl@1.1/1.1.1h/include -L/usr/local/Cellar/openssl@1.1/1.1.1h/lib -lssl -lcrypto mac_example.c -o mac_example

https://rubenlaguna.com/post/2015-02-05-compute-aes-cmac-using-openssl-slash-libcrypto

I've compiled it.
thanks!!